Shaving cream containing polysiloxanes



United States Patent 3,298,919 SHAVING CREAM CONTAINING POLYSILOXANESJack L. Bishop,'Jr., and Charles W. Todd, Midland,

Mich., assignors to Dow Corning Corporation, Midland, Mich., acorporation of Michigan No Drawing. Filed Dec. 26, 1962, Ser. No.247,337 10 Claims. (Cl. 16785) The addition of silicone fluids topreelectric shave andaftershave lotions is well known. The addition ofsilicone fluids to pre-electric shave lotions is particularly desirablesince the silicone fluids lubricate the skin and eliminate razor burnsthus resulting in a superior shave. The silicone fluids also tend tomake the face and neck feel good and help to keep perspiration andwater-borne irritants from causing or aggravating annoying rashes.

Attempts have been made to incorporate silicone fluids in shaving creamsbut such attempts have been without success since the silicone fluidsdefoam the shaving lather as might well be expected since silicones arenotorious as antifoami'ng agents.

It has now been discovered by applicant that certain silicone fluids canbe incorporated into shaving creams if properly, formulated.

The addition of the silicone fluids to the shaving cream gives increasedlubricity and reshavability to the formulation.

This invention relates to a shaving cream comprising about 0.5 to 9percent stearic acid, about 0.5 to 3 percent lauric acid, about 1 to 15percent glycerine, about 1 to 7 percent triethanolamine, about 40 to 80percent water, about 2 to 12 percent of a propellant and about 0.1 topercent of a silicone fluid, said percents being on a weight basis.

Silicone fluids that can be used in accordance with this invention are,for example, those having the general formula CH C (OCZH4)nOC3H6SlOwherein n has an average value of from 3 to 4 inclusive,polydimethylsiloxane fluids having the general formula(CHs)aSi(OSi)xOSi(GHg) I wherein x has an average value of from.0 to 160inclusive and having a viscosity in the range of 0.65 to 500 cs. at 25C., copolymers consisting essentially of phenylmethyl anddimethylsiloxane units, hydroxylated polydimethylsiloxane fluids andpreferably those hydroxylated polydimethylsiloxane fluids having aviscosity in the range of 30 to 50 cs. at 25 C. and containing 3.5 to4.5 percent by weight silicon-bonded hydroxyl groups and siloxaneshaving the general formulas Me: M02

wherein R is a hydrocarbon radical free of aliphatic unsaturation andcontains from 1 to inclusive carbon atoms, Me is a methyl radical, n hasan average value of from 6 to 30, R is an alkylene radical containingfrom "ice 2 to 4 inclusive carbon atoms, In has an average value of from25 to 80, A is selected from the group consisting of O 0 -OR, O( iR and--O(||3OR,

R is selected from the group consisting of hydrocarbon andhydrocarbonoxy radicals free of aliphatic unsaturation and containingfrom lvto 10 inclusive carbon atoms, a has an average value of from 0 to2 inclusive, b has an average value of from 1 to 2 inclusive and c hasan average value of from 3 to 4 inclusive, said siloxane containing atleast 13 percent by weight of Me SiO units based on the weight of thesiloxane In the hydroxylated polydimethylsiloxane fluids, the hydroxygroups are predominantly found on the end of the chain, althoughsome canbe present along the chain.

The amount of the silicone fluid employed can be varied over a widerange. Amounts ranging from 0.1 to 5 percent by weight can be used. Itis preferred that about 0.5 to 2 percent be employed.

When the shaving cream is an aerosol formulation, any suitablepropellant can be employed. Examples of suitable propellants aretrichloromonofluoromethane, dichlorodifluoromethane,monochlorotrifluoromethane, carbon tetrafluoride,dichloromonofluoromethane, monochlorodifluor-omethane,monobromotrifluoromethane, dibromodifluoromethane, trifluoromethane,tetrachlorodifluoroethane, trichlorotrifluoroethane,dichlorotetrafluoroethane, dibromomonochlorotrifluoroethane,dibromotetrafluoroethane, monochloropentafluoroethane, ethylidenefluoride, 1,1,1-difluorochloroethane and mixtures thereof. Thesematerials are well known articles of commerce, the last two being soldunder the trademark Genetron and the remainder being sold under thetrademark Freon.

The following examples are for purposes of illustration only and shouldnot be construed as limiting to the invention.

The formulation of Example 1 is the preferred embodiment of thisinvention. It is useful per se as a shaving cream but more important itcan be used as a base formulation with which other well knowningredients of shaving creams can be blended or formulated.

All percents and parts referred to herein are on a weight basis unlessotherwise specified.

Example 1 A shaving cream was prepared by mixing 4.05 percent stearicacid, 1.35 percent lauric acid, 9.00 percent glycerine, 3.24 percenttriethanolamine, 71.36 percent water,

10.00 percent dichlorodifluoromethane and 1.00 percent of a siloxanefluid having the general formula wherein n has an average value of from3 to 4.

Samples of the above formulation and an identical formulation exceptthat it contained no silicone fluid were submitted to a panel of peoplefor personal evaluation and comparison. The panel members were asked torate the samples on characteristics such as razor drag, reshavability,lubricity, comfort of the shave, feel of the skin, quality and quantityof the foam, etc. On the average, the formulation containing thesilicone fluids was rated superior in every category and the addition ofthe silicone fluid resulted in no loss of foam quality or quantity.

While Example 1 sets forth the preferred embodiment of this invention,the amounts of the various ingredients employed therein can be variedWithin the following ranges:

Percent Stearic acid 0.5-9 Lauric acid 0.5-3 Glycerine 1-15 Siliconefluid 0.1- Triethan'olamine 1-7 Water 40-80 Propellant 2-12 Thefollowing ingredients are illustrative of the other ingredients whichcan be blended with the shaving cream formulations of this invention:

Example 2 A shaving cream was prepared by mixing 4.05 percent stearicacid, 1.35 percent lauric acid, 9.00 percent glycerine, 3.24 percenttriethanolamine, 67.36 percent Water, 10.00 percentdichlorodifluoromethane and 5.00 percent of a siloxane fluid having thegeneral formula 11 i CH30(0C2I'I4)nOC3H6SlO wherein n has an averagevalue of from 3 to 4.

This formulation performed as well as that of Example 1 and in additionhad greater lubricity.

Example 3 Below is a list of other silicone fluid that were substitutedfor the silicone fluid of Example 1 in a like amount. All of the fluidsgave a superior formulation as compared to the formulation without asilicone fluid and caused substantially no loss in foam quality orquantity.

(a) Hexamethyldisiloxane fluid having a viscosity of 0.65 cs. at C. l

(b) A polydimethylsiloxane fluid having a viscosity of 100 cs. at 25 C.of the formula Mez MezSiO (S iO) xsiMe (c) An absolute ethanol solublepolydimethylsiloxane fluid having a viscosity of 7-12 cs. at 25 C.

(d) A silicone fluid consisting essentially of phenylmethyl anddimethylsiloxane units.

(e) A hydroxylated polydimethylsiloxane fluid having a viscosity of -50cs. at 25 C. and containing 3.5 to 4.5 percent by Weight hydroxylgroups.

(f) a siloxane fluid having the general formula When the followingingredients are mixed a good shaving cream is obtained: 6.2 percentstearic acid, 1.73 percent lauric acid, 7.0 percent glycerine, 0.2percent of the silicone fluid of Example 1, 2.8 percent triethanolamine,0.75 percent lanolin, 2.1 percent sor-bitan monostearate,

0.35 percent potassium hydroxide, 4.0 percent petr-olatum, 69.8 percentwater and 8.2 percent of amixture of dichlorodifluoromethane anddichloromonofluoromethane.

Example 5 When the following ingredients are mixed a good shaving creamis obtained: 6.2 percent stearic acid, 1.73 percent lauric acid, 10.2percent glycerine, 3.1 percent ofthe silicone fluid of Example 1, 4.18percent triethanolamine, 5.52 percent Sorbo, 2.13 percent cetyl alcohol,3.0 percent sodium lauryl sulfate, 2.67 percent lanolin, 0.3 percentperfume, 49.72 percent Water and 11.25 percent dibromodifluor'omethane.

That which is claimed is:

1. A shaving cream comprising about 0.5 to 9 percent stearic acid, about0.5 to 3 percent lauric acid, about 1 to 15 percent glycerine, about 1to 7 percent triethanolamine, about 40 to percent water, about 2 to 12percent of a propellant and about 0.1 to 5 percent of a silicone fluidselected from the group consisting of (I) fluids having the formulaWhere n has an average value of from 3 to 4, (II) polydimethylsiloxanefluids having the formula (CH );Si(0Si),OSi(CHs)| wherein x has anaverage value of from 0 to inclusive and having a viscosity in the rangeof 0.65 to 500 cs. at 25 C., (III) absolute ethanol solublepolydimethylsiloxane fluids having a viscosity in the range of 5 to 15cs. at 25 C., (IV) copolymer fluids consisting essentially ofphenylmethyl and dimethylsiloxane units, (V) hydroxylatedpolydimethylsiloxane fluid having a viscosity in the range of 3 to10,000 cs. at 25 C. and containing about 0.1 to 5 percent by weighthydroxyl groups, and (VI) siloxane fluids selected from the groupconsisting of (l) siloxanes having the formula R,,[(OSi)nOSi(OHz)(OR")mA] (2) siloxanes having the formula (GHz)a( )mA Mez M62 M62A(R"o)m oH )asi(Osi)n[oei]bosi(oH2),(0R" ...A

Me and (3) siloxanes having the formula Me; (CH2)s(OR)mAMe,si(osi),.[osIi].osiMe Me wherein R is hydrocarbon free of aliphaticunsaturation and contains from 1 to 10 inclusive carbon atoms, Me ismethyl, n has an average value of from 6 to 30, R" is alkylenecontaining from 2 to 4 inclusive carbon atoms, In has an average valueof from 25 to 80, A is selected from the group consisting of -OR',

R is selected from the group consisting of hydrocarbon andhydrocarbonoxy free of aliphatic unsaturation and containing from 1 to10 inclusive carbon atoms, a ha an average value of from 0 to 2inclusive, b has an average value of from 1 to 2 inclusive and c has anaverage value of from 3 to 4 inclusive, said siloxane containing atleast 13 percent by weight of Me SiO units based on the weight of thesiloxane, said percents being on a weight basis.

2. The shaving cream of claim 1 wherein said silicone fluid has theformula CHE II orraowoiHnnooamsio wherein n has an ave-rage value offrom 3 to 4.

. 5 3. The shaving cream of claim 1 wherein said silicone fluid is apolydimethylsiloxane fluid having the formula (C ah(CHS)BSI(OSI);OSI(OH3)B I wherein x has an average value of from to 160inclusive and having a viscosity in the range of 0.65 to 500 cs. at 25C.

4. The shaving cream of claim' 3 wherein said silicone fluid is an.absolute ethanol soluble polydimet-hylsiloxane fluid having a viscosityin the range of to 15 cs. at 25 C.

5. The shaving cream of claim 1 wherein said silicone fluid is acopolymer consisting essentially of phenylmethyl and dimethylsiloxaneunits.

6. The shaving cream of claim 1 wherein said silicone fluid is ahydroxylated polydimethylsilox-ane fluid having a viscosityin the rangeof 3 to 10,000 cs. at 25 C. and containing about 0.1 to 5 percent byweight hydroxyl groups. L

7. The shaving cream of claim 1 wherein said silicone fluid is asiloxane selected from the group consisting of (1) siloxanes having theformula Y M62 M62 R,[(OSi)nOSi(CH (OR) A]4-, (2) siloxanes having theformula Mez Mez (CH2)3(OR")mA LIezA(RO)m(CH2)3Sl(OSl)n[Oii]bOSi(OH2)3(OR mA and (3) siloxanes having theformula M62 (CHz)3(OR")mA Me Si(OSi)n[OSi]OSiMe l Me wherein R ishydrocarbon free of aliphatic unsaturation and contains from 1 toinclusive carbon atoms, Me is methyl, n has an average value of from 6to 30, R" is alkylene containing from 2 to 4 inclusive carbon atoms, mhas an average value of from 25 to 80, A is selected from the groupconsisting of OR',

o 0 O(3R and O(%OR R is selected from the group consisting ofhydrocarbon and hydrocanbonoxy free of aliphatic unsaturation andcontaining from 1 to 10 inclusive carbon atoms, a has an average valueof from 0 to 2 inclusive, b has an average value of from 1 to 2inclusive and c has an average value of from 3 to 4 inclusive, saidsiloxane containing at least 13 percent by weight of Me 'SiO units basedon the weight of the siloxane.

8. A shaving cream consisting essentially of 4.05 percent stearic acid,1.35 percent lauric acid, 9.00 percent glycerine, 3.24 percenttriethanolamine, 67.36 to 72.26 percent water, 10 percent of apropellant and 0.1 to 5 percent of a silicone fluid selected from thegroup consisting of (I) fluids having the formula CH3 cHggKoczHflnocaHusio where n has an average value of from 3 to 4, (H) polydimethylsiloxanefluid having the formula (C a)z (CH3)3Si(Obi)xOSi(CH3)3 wherein x has anaverage value of from 0 to 160 inclusive and having a viscosity in therange of 0.65 to 500 cs. at 25 C., (III) absolute ethanol solublepolydimethylsiloxane fluids having a viscosity in the range of 5 to 15cs. at 25 C., (IV) copolymer fluids consisting essentially ofphenylmethyl and dimethylsiloxane units, (V) hydroxylatedpolydimethylsiloxane fluids having a viscosity in the 6 range of 3 to10,000 cs. at 25 C. and' containing about 0.1 to 5 percent by weighthydroxyl groups, and (VI) siloxane fluids selected from the groupconsisting of (1) siloxanes having the formula Me; Me:

R .[(OSi)uOSi(CHz)a(OR) A] (2) siloxanes having the formula (OHa)a(OR)mAMe: Me: Mez A(R"o)m(oH2)asi(osi)..[0si] 0si(oH, 3(oR")mA and (3)siloxanes having the formula Men (CHz)3(OR") AMeaSi(OSi)n[OSIi],,-OSiMes wherein R is hydrocarbon free of aliphaticunsaturation and contains from'l to 10 inclusive carbon atoms, Me ismethyl, n has an average value of from 6 to 30, R is alkylene containingfrom 2 to 4 inclusive carbon atoms, In has an average value of from 25to 80, A is selected from the group consisting of --OR,

M ii OCR',and-OCOR' R is selected from the group consisting ofhydrocarbon and hydrocarbonoxy free of aliphatic unsaturation andcontaining from 1 to 10 inclusive carbon atoms, a has an average valueof from 0 to 2 inclusive, b has an average value of from 1 to 2inclusive and c has an average value of from 3 to 4 inclusive, saidsiloxane containing at least 13 percent by weight of Me SiO units basedon the weight of the siloxane, said percents being on a weight basis.

9. The shaving cream of claim 8 wherein said silicone fluid has theformula n i CHaU (O CzHOnO CaHnSlO wherein n has an average value offrom 3 to 4.

10. A method of shaving which comprises the steps of applying to theface a foam from a shaving cream comprising about 0.5 to 9 percentstearic acid, about 0.5 to 3 percent lauric acid, about 1 to 15 percentglycerine, about 1 to 7 percent triethanolamine, about 40 to percentwater, about 2 to 12 percent of a propellant and about 0.1 to 5 percentof a silicone fluid selected from the group consisting of (I) fluidshaving the formula H CH3 (EH30 (O CZHOHO osHuSiO where n has an averagevalue of from 3 to 4, (II) polydimethylsiloxane fluids having theformula (CHa)sSi(CSi)=CSi(CH wherein x has an average value of from 0 toinclusive and having a viscosity in the range of 0.65 to 500 cs. at 25C., (III) absolute ethanol soluble polydimethylsiloxane fluids having aviscosity in the range of 5 to 15 cs. at 25 C., (IV) copolymer fluidsconsisting essentially of phenylmethyl and dimethylsiloxane units, (V)hydroxylated polydimethylsiloxane fluids having a viscosity in the rangeof 3 to 10,000 cs. at 25 C. and containing about 0.1 to 5 percent byweight hydroxyl groups, and (VI) siloxane fluids selected from the groupconsisting of (1) siloxanes having the formula (2) siloXanes having theformula Mez Men (CHz)a(OR)mA M82 A(RO)m(CH2)Si(OSi)n[OSi]bOi(CHz)3(0R).A

and (3) siloxanes having the formula M62 (OH2)Z(OR)mA Me;Si(O Si) Si]eOSiMe3 ile wherein R is hydrocarbon free of aliphatic unsaturation andcontains from 1 to 10 inclusive carbon atoms, Me is methyl, n has anaverage value of from 6 to 30, R" is alkylene containing from 2 to 4inclusive carbon ato-ms, in has an average value of from 25 to 80, A isselected from the group consisting of OR',

-Oi JR, and -OILIJOR R is selected from the group consisting ofhydrocarbon and hydrocarbonoxy free of aliphatic unsaturation andcontaining from 1 to 10 inclusive carbon atoms, a has an average valueof from 0 to 2 inclusive, b has an average value of from 1 to 2inclusive and c has an average value 8 of from 3 to 4 inclusive, saidsiloxane containing at least 13 percent by weight of Me SiO units basedon the weight of the siloxane, said percents being on a weight basis,and thereafter shaving with a razor.

References Cited by the Examiner UNITED STATES PATENTS 10/1953 Spitzerl6739 3/1958 Geen ..167-87 OTHER REFERENCES JULIAN S. LEVITT, PrimaryExaminer.

FRANK CACCIAPAGLIA, JR., Examiner.

ANNA P. FAGELSON, Assistant Examiner.

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No.3,298,919 January 17, 1967 Jack L. Bishop, Jr., et a1.

he above numbered pat- It is hereby certified that error appears in tPatent should read as ent requiring correction and that the said Letterscorrected below.

Column 1, lines 45 and 46, after the formula, strike out "I"; column 3,line 45, for "fluid" read fluids line 72,

for "6.2 percent stearic acid, 1.73" read 3.5 percent stearic acid, 1.3column 4, lines 50 to 54., the formula should appear as shown belowinstead of as in the patent:

e (CH2) (0R" A Me Si(OSi) [OSi] OSiMe Signed and sealed this 24th day ofOctober 1967.

(SEAL) Attest:

L "PW/ARI) M.FLETCHER,JR. EDWARD J. BRENNER ALLc'wi ting OfficerCommissioner of Patents

1. A SHAVING CREAM COMPRISING ABOUT 0.5 TO 9 PERCENT STEARIC ACID, ABOUT0.5 TO 3 PERCENT LAURIC ACID, ABOUT 1 TO 15 PERCENT GLYCERINE, ABOUT 1TO 7 PERCENT TRIETHANOLAMINE, ABOUT 40 TO 80 PERCENT WATER, ABOUT 2 TO12 PERCENT OF A PROPELLANT AND ABOUT 0.1 TO 5 PERCENT OF A SILICONEFLUID SELECTED FROM THE GROUP CONSISTING OF (I) FLUIDS HAVING THEFORMULA